PCI-DSS compliance forces Lambda functions into VPCs—even when technically unnecessary. The requirement stems from PCI's mandate to control egress traffic from all compute resources, regardless of whether that control provides actual security value.
For Lambda functions accessing only AWS services like DynamoDB or S3, VPC attachment adds latency and complexity without high security benefit. These services expose public APIs; routing through your VPC to reach them creates unnecessary network hops.
Yet compliance auditors check one box: "Can you restrict outbound traffic?" Without VPC attachment, Lambda functions cannot apply security group rules, so the answer is no. The auditor moves on, satisfied.
This illustrates a broader pattern in compliance frameworks. Requirements written for traditional infrastructure poorly map to cloud-native architectures. Rather than fighting this reality, accept the overhead as a cost of compliance.
Configure your Lambda functions with VPC attachment, assign appropriate security groups allowing HTTPS egress, and document the configuration. Focus engineering effort on meaningful security controls rather than debating checkbox requirements.
Best,
Thorsten
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